Radio astronomical probes of the 1 st galaxies Chris Carilli, Aspen, February 2008  Current State-of-the-Art: gas, dust, star formation in QSO host galaxies at z ~ 6  Pushing to normal galaxies with ALMA and the EVLA USA – Carilli, Wang, Wagg, Fan, Strauss Euro – Walter, Bertoldi, Cox, Menten, Omont

Why QSO hosts?  Spectroscopic redshifts  Extreme (massive) systems L BH > 1e14 L o M BH > 1e9 M o => M host > 1e12 M o  All low z spheroidal galaxies have SMBH: M BH =0.002 M bulge  ‘Causal connection between SMBH and spheroidal galaxy formation’  Current mm/cm sensitivities require (very) extreme galaxies Magorrian, Tremaine, Gebhardt, Merritt…

1/3 of luminous QSOs have S 250 > 2 mJy, independent of redshift from z=1.5 to 6.4 L FIR ~ 1e13 L o (HyLIRG) ~ 0.1 x L bol = thermal emission from warm dust: dust heating by starburst or AGN? MAMBO 250 GHz surveys of z>2 QSOs 1e13 L o 2.4mJy

Dust => Gas: L FIR vs L’(CO)  non-linear => increasing SF eff (SFR/Gas mass) with increasing SFR  SFR > 1000 M o /yr, Gas masses > 2e10 M o Index=1.5 1e11 M o 1e3 M o /yr z ~ 6 QSO hosts Star formation rate Gas Mass

Black hole mass ~3 x 10 9 M o Dust mass ~ 7e8 M o Gas mass ~ 2e10 M o CO size ~ 6 kpc Note: low order molecular lines redshift to cm bands Pushing into Cosmic Reionization: J at z = 6.42 (t univ = 870 Myr) SDSS J z=6.42 1” ~ 6kpc CO3-2 VLA Dust formation? AGB Winds take > 1.4e9yr > age Universe => dust formation associated with high mass star formation (Maiolino+ 07, Dwek+ 2007, Shull+ 2007)? L FIR = 1.2e13 L o

 FIR excess -- follows Radio-FIR correlation: SFR ~ 3000 M o /yr  CO excitation ~ starburst nucleus: T kin ~ 100K, n H2 ~ 1e5 cm^-3 Radio-FIR correlation 50K Elvis QSO SED Continuum SED and CO excitation ladder NGC253

Gas dynamics: Potential for testing M BH - M bulge relation at high z. mm lines are only direct probe of host galaxies M dyn ~ 4e10 M o M gas ~ 2e10 M o M bh ~ 3e9 M o => M bulge ~1e12 M o (predicted) z=6.42 z<0.5

[CII] 158um at z=6.4: gas cooling [CII] PdBI Walter et al.  z>4 => FS lines redshift to mm band  [CII] traces star formation: similar extension as molecular gas ~ 6kpc  L [CII] = 4x10 9 L o (L [NII] < 0.1 L [CII] )  SFR ~ 6.5e-6 L [CII] ~ 3000 M o /yr 1” [CII] + CO 3-2 [CII] [NII]

[CII] -- the good and the bad  [CII]/FIR decreases rapidly with L FIR (lower heating efficiency due to charged dust grains?) => ultraluminous starbursts are still difficult to detect in C+  Normal star forming galaxies (eg. LAEs) are not much harder to detect! Maiolino Malhotra Current PdBI can detected 10x fainter [CII] source than at z>6.4 => FIR ~ 1e11 L o (SFR ~ 50 M o /yr): any candidates with  z < 0.06?

Building a giant elliptical galaxy + SMBH at t univ < 1Gyr  Multi-scale simulation isolating most massive halo in 3 Gpc^3 (co-mov)  Stellar mass ~ 1e12 M o forms in series (7) of major, gas rich mergers from z~14, with SFR ~ 1e3 - 1e4 M o /yr  SMBH of ~ 2e9 M o forms via Eddington-limited accretion + mergers  Evolves into giant elliptical galaxy in massive cluster (3e15 M o ) by z= Li, Hernquist, Roberston.. 10 Rapid enrichment of metals, dust? molecules? in ISM Rare, extreme mass objects: ~ 100 SDSS z~6 QSOs on entire sky Integration times of hours to days to detect HyLIGRs

What is EVLA? First steps to the SKA Antenna retrofits now 50% completed. Early science in 2010, using new correlator. Project completed Full upgrade of 30 year old VLA electronics: multiply ten-fold the VLA’s observational capabilities, including 10x continuum sensitivity (1uJy), full frequency coverage (1 to 50 GHz), 80x BW (8GHz)

50 x 12m array Atacama Compact Array 12x7m + 4x12m TP What is ALMA? North American, European, Japanese, and Chilean collaboration to build & operate a large millimeter/submm array at high altitude site (5000m) in northern Chile -> order of magnitude, or more, improvement in all areas of (sub)mm astronomy, including resolution, sensitivity, and frequency coverage.

(sub)mm: high order molecular lines. fine structure lines -- ISM physics, dynamics cm telescopes: low order molecular transitions -- total gas mass, dense gas tracers Pushing to normal galaxies: spectral lines  FS lines will be workhorse lines in the study of the first galaxies with ALMA.  Study of molecular gas in first galaxies will be done primarily with cm telescopes SMA ALMA will detect dust, molecular, and FS lines in ~ 1 hr in ‘normal’ galaxies (SFR ~ 10 M o /yr) at z ~ 6, and derive redshifts directly from mm lines.

cm: Star formation, AGN (sub)mm Dust, molecular gas Near-IR: Stars, ionized gas, AGN Arp 220 vs z Pushing to normal galaxies: continuum A Panchromatic view of galaxy formation

ESO ALMA Status Antennas, receivers, correlator fully prototyped, now in production: best (sub)mm receivers and antennas ever! Site construction well under way: Observation Support Facility and Array Operations Site North American ALMA Science Center (C’Ville): gearing up for science commissioning and early operations Timeline Q1 2007: First fringes at ATF (Socorro) Q1 2009: Three antenna array at AOS Q2 2010: Early science call for proposals Q4 2010: Start early science (16 antennas) Q4 2012: Full operations

ESO END

ALMA into reionization Spectral simulation of J  Detect dust emission in 1sec (5  ) at 250 GHz  Detect [CII] in 1min  Detect multiple lines, molecules per band => detailed astrochemistry  Image dust and gas at sub- kpc resolution – gas dynamics HCN HCO+ CO CCH

Operations Support Facility, Dec 07 ALMA Progress ALMA Operations Site

[CII] traces warm dust [CII] 158um fine structure line: dominant ISM gas cooling line

ALMA will detect dust, FS lines in 1 to 3 hours in normal galaxies at z ~ 6: LAEs, LBGs cm telescopes: low order molecular transitions -- total gas mass, dense gas tracers (sub)mm: high order molecular lines. fine structure lines -- ISM physics, dynamics Pushing to normal galaxies: spectral lines  FS lines will be workhorse lines in the study of the first galaxies with ALMA.  Study of molecular gas in first galaxies will be done primarily with cm telescopes

SDSS J z=5.8 10” SharkII CSO 350um rms= 6mJy Chance projection < 1%  L FIR ~ 1e13 L o => SFR ~ 2500 M o /yr  M(H 2 ) ~ 2e10 M o  HyLIRG QSO host + ‘submm galaxy’ companion, separation = 87kpc  Biased massive galaxy formation?

Low z IR QSOs: major mergers AGN+starburst? Low z Optical QSOs: early- type hosts Z~6 FIR - L bol in QSO hosts FIR luminous z ~ 6 QSO hosts follow relation establish by IR- selected QSOs at low z => (very) active star forming host galaxies? Wang + 08, Hao 07